Nose-to-Tail Modulation of Three-Phase 12N Switching-Cells Inverter for Zero Common Mode Voltage

Aiming at a class of transformerless three-phase DC/AC inverters with N times of 12 switching-cells, this letter proposes a novel nose-to-tail modulation (NTM) method which can realize zero common-mode voltage (CMV). The NTM algorithm places the driving pulses nose-to-tail of the six conversion unit...

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Bibliographic Details
Published inIEEE transactions on power electronics pp. 1 - 5
Main Authors Teng, Jiaxun, Sun, Xiaofeng, Wang, Zizhe, Fu, Huanshuai, Zhao, Wei, Qi, Lei, Li, Xin
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2023
Subjects
Common mode voltage
Inverters
Logic gates
Modulation
nose-to-tail modulation
Phase modulation
Switches
three-phase inverters
Topology
Voltage
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Summary:Aiming at a class of transformerless three-phase DC/AC inverters with N times of 12 switching-cells, this letter proposes a novel nose-to-tail modulation (NTM) method which can realize zero common-mode voltage (CMV). The NTM algorithm places the driving pulses nose-to-tail of the six conversion units in the upper/lower arms, so as to realize the same number of units put into the upper and lower arms at any time. In addition, a dead-time compensation scheme achieving the elimination of narrow pulse CMV caused by dead-time is also proposed for NTM. As a result, the zero CMV can be achieved. Although the proposed NTM slightly increases the modulation complexity, it is of great significance in CMV sensitive systems such as grid-tied and motor drive systems. The effectiveness of the proposal is verified by experiments.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2023.3282622